One of the 3 requirements for making a purchase on Ro.place is a having a small limited item on your roblox account, so we can trade you the item you're going to buy.
Go to the ROBLOX marketplace.
2. Under "Category" on the left side of your screen, select the following 3 search filters as displayed in the screenshot below.
Sales Type - Limited
Creator - Type "roblox" into the username box
Sorts - Price (Low To High)
3. When choosing a small limited to buy, be sure it is not a UGC item, it must be a small limited created by roblox. Once you have found a small limited to purchase (ex - Cake Topper, Epic Egg, Eggmunition), you can now purchase it from the catalog.
You must wait 7 days from the time of purchasing your small limited on the catalog, for it to be off trade hold and tradeable.
After this time has elapsed, you can select the small limited as the item you want to trade for at checkout!