You can both kinda game the system in shops
If you each bid 500T$ for a shop
You can then post 10 items you want at 200T$ at 2 stock each.
You post their stuff and they post yours. Then buy it for yourselves for a total of 10 designs of your choice for around 250T$ each
It's not some amazing bargain but it's cheaper than the 400-450 range stuff is going for
Oh yeah and you get 10% of sales so if your stock sells out you get 400T$ back so it's really 210T$ a design (230T$ if for some reason no one else buys the extra copies of what you post)