So I wait a couple of days for them to come back into stock

So they're in "pre-order" status, and though you know you want to buy one, you don't.

so I wait another before going to order it

So you don't have the money anyway, and you have to wait to order.

only to find it's out of stock again and won't be replenished until the 23rd

Now you have the money, you know they'll be in stock again within a couple of weeks... What, are you going to spend your money on something else and repeat the same thing in 2 weeks? Why don't you just order it now? So what "they don't have it in stock", you know they're coming, you know they'll be sold out quickly again, why are you bitching? You know you want it, you have the money to buy it, you know they'll be shipped at the end of the month, what's the problem? This isn't a product you pick off the shelf at Walmart, it's one company offering it online and they get periodic shipments because they can't stock enough to have a rolling inventory without gaps. Yeah, they could maybe do better, but it's not like you're going to spend months waiting or the company will just up and disappear with your money after you order.

The wheel stand is a great entry-level product for simracing, I waited a couple of weeks before mine came, no big deal, and now I'm enjoying the hell out of it. You have the money for it, you know you'll get it if you order, so just do it. You're the only thing standing in your way, get over it.