Thats exactly right. I kept checking craigslist until I found someone that had them reasonable enough priced. I ended up paying $1 a block and I got 60 of them to fit in my truck.That is going to vary by location. You can check any stores that sell trailers. Also I guess Lowes/Tractor Supply have them but people say you have to ask. For example, I have a trailer sales & service store near me that advertises periodically on Craigslist that they have them for pickup during business hours.