So, you want summer cyberpunk survivalist. We can do this!
I found most of these in the first hour, so items are probably a little above your budget. But, like you said, it'll give you an idea. But do spend the money on shoes - always invest in your feet!
Now, two simple rules for summer cyberpunk:
First, black. I'm sure everyone here will agree that black makes you more badass in every situation. But you will get hot, so your black gear needs to be natural materials or blends as much as possible - cotton, rayon, leather, linen, etc.
Second, structure. Usually people go really lacy and hippie with during the summer. You won't be doing that. Maybe, MAYBE some draping or floaty sheer tops, but crotchet cover ups are not cyberpunk. We want structure, smooth lines, nice tailoring. No ruffles, frills, scallop hems, none of that. And dear god, no smocking or fringe!
SANDALS:
I actually own these, they are gorgeous in person ----> http://www.6pm.com/seychelles-wont-stop-black-silver
http://www.6pm.com/charles-by-charles-david-mirage-silver-combo
http://www.6pm.com/franco-sarto-metro-black-leather
http://www.6pm.com/nine-west-plaidperfect-black-leather
http://www.6pm.com/lucky-brand-beverlee-black
http://www.6pm.com/circus-by-sam-edelman-selma-black
http://www.6pm.com/rebels-melvi-black
http://www.6pm.com/volatile-collective-black
http://www.6pm.com/circus-by-sam-edelman-sofia-black
http://www.6pm.com/rebels-robyn-silver
http://www.6pm.com/type-z-opanek-black-multi
SHORTS:
I OWN THESE AND LOVE THEM. They are more versatile than you'd think! Shorts say it's summer. Leather shorts say you're a badass despite the heat. -----> http://us.asos.com/Warehouse-Leather-Shorts/158uxd/?iid=4508291&cid=9263&sh=0&pge=0&pgesize=204&sort=-1&clr=Black&totalstyles=217&gridsize=3&mporgp=L1dhcmVob3VzZS9XYXJlaG91c2UtTGVhdGhlci1TaG9ydHMvUHJvZC8.
I lived in these linen shorts last summer. ----> http://oldnavy.gap.com/browse/product.do?cid=1009253&vid=1&pid=173934082
White shorts can be cyberpunk too, as long as they are NOT linen. (White linen is very traditional summer.) Get these cotton ones and replace the wooden button with a silver one. ----> http://oldnavy.gap.com/browse/product.do?cid=1009253&vid=1&pid=173922
Gray shorts would work too, if white bottoms aren't your thing. ------> http://oldnavy.gap.com/browse/product.do?cid=1009253&vid=1&pid=173927002
COVER UPS AND TOPS
http://www.nastygal.com/product/motel-arrow-mesh-swim-cover-up
http://www.nastygal.com/product/nasty-gal-where-the-sun-dont-shine-mesh-crop-coverup-
http://www.dollskill.com/heidi-mesh-jersey.html
http://www.dollskill.com/cap-sleeve-maxi-dress.html
http://www.dollskill.com/maya-wrap-dress.html
http://www.dollskill.com/sleeveless-kino-ninja-hoodie.html
BAGS AND ACCESSORIES
A little bit more futuristic than your typical mesh bag. -----> http://us.asos.com/new-look/new-look-perspex-mesh-backpack/prod/pgeproduct.aspx?iid=4846027&clr=Black&SearchQuery=Mesh&pgesize=204&pge=1&totalstyles=686&gridsize=3&gridrow=2&gridcolumn=1
But if you don't want everyone seeing your stuff. -----> http://www.nastygal.com/accessories-bags-backpacks/nasty-gal-x-nila-anthony-holier-than-thou-vegan-leather-backpack
Mirrored aviators are the classic cyberpunk sunglasses -----> http://us.asos.com/ASOS/ASOS-Silver-Aviator-Sunglasses-With-Mirrored-Lens/Prod/pgeproduct.aspx?iid=4728535&cid=4545&sh=0&pge=0&pgesize=204&sort=-1&clr=Silver&totalstyles=280&gridsize=3
But I like cat eyed glasses for sass. -----> http://us.asos.com/ASOS-Half-Frame-Metal-Cat-Eye-Sunglasses/15j7ee/?iid=4697367&cid=4545&sh=0&pge=0&pgesize=204&sort=-1&clr=Black+with+gold&totalstyles=280&gridsize=3&mporgp=L0FTT1MvQVNPUy1IYWxmLUZyYW1lLU1ldGFsLUNhdC1FeWUtU3VuZ2xhc3Nlcy9Qcm9kLw..
http://www.dollskill.com/upgrade-sunglasses.html
Tinted wraparound glasses are very futuristic IMO. -----> http://www.6pm.com/vonzipper-liftoff-white-quasar-chrome
http://www.6pm.com/columbia-102-matte-black-blue-flash-polarized