[header] How to share a flea market booth [title] Verify with the flea market staff that sharing a booth is permissible. [step] If there is a contract for renting the booth space, ask if you and your partner both need to sign the document. [title] Locate a fellow flea market vendor and pair up. 
[substeps] Because you will be spending a lot of time together setting up your booth and selling through the duration of the flea market, this should be someone you can easily get along with. Also, because you will be handling cash transactions, the person needs to be reliable and trustworthy.