I regularly do Walmart merchandising. I prefer to bring my own short ladder (two steps). They're less than $20. I also bring my goodie bag with a pair of pliers, screwdriver, scissors/aviation snips, dusting cloth, goo-gone, tape. My goodie bag is funded by the "you will be reimbursed up to $3" or something of the like.
You can get a lot of the supplies at Walmart, but the hassle, if you're on a tight schedule, is so time-consuming.
Don't forget to sign in and put on a vendor tag ( or bring your own if you have been assigned one) or the asset protection folks will be staring at you keenly on camera and some may have a few choice words to share.
Silver certified in N.C. Shopping since 2005.