When making a purchase on Ro.Place, one of our 3 requirements is to have a small limited item 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, enter the following 3 search filters (As shown in the screenshot below):
Sales Type - Limited
Creator - Type "ROBLOX" in the Username box
Sorts - Price (Low to High)
3. When choosing a limited make sure it is not a UGC item, it has to be a tradeable limited! Now once you have found a cheap limited (Ex: Tiger Egg, Saber Boss Egg) the item will be put on a 7-day trade hold, in 7 days you can select it as the item you want to trade for at checkout.