Try looking at the collapsible wagons at Costco. They run about $60. This is what they look like:
https://www.bing.com/search?q=costco+collapsible+wagon&form=EDNTHT&mkt= en-us&httpsmsn=1&plvar=0&refig=48be5011184446a0a555c6 e048750521&sp=1&ghc=1&qs=SC&pq=costco+colapsa&sk=P RES1&sc=8-14&cvid=48be5011184446a0a555c6e048750521&cc=US&set lang=en-US