I'd like a 3 person bike rack that fits a pop-up trailer. I'd like one at the max price of $100.00. I also want a store not some website. Is it even possible?

I hope this 3 Bike Rack fits what you are looking for. I found for you this Deluxe 3 Bike Rack Carrier for 1 1/4" & 2" Hitch for $69.97 at Walmart.   
The Description for this item:
    * Bike rack hitch insert fits either 1 1/4" OR 2" receiver hitches
    * Carry arm spacing accommodates a wide range of frame sizes and designs
    * Patented tie-down cradle system individually secures and protects bicycles
    * Bike rack features carry arms that fold out of the way when not in use
    * Rack tilts back for easy lift-gate access
    * No-wobble bolt eliminates movement of rack inside of hitch
    * All bike rack retainer clips attached with lanyards to prevent lost parts
    * Minor assembly required
    * Bike rack has black powder-coated finish