I think I paid $100 for mine ten years ago. I made sure it had been used for food products and not anything petrol. It had a redish colored syrup still inside of it. I had seen them for less, but didn't need one then, and when I decided that I had to have one, that was the best prices that I could find.
Mine has a big threaded drain at the bottom that I was able to find a PVC threaded fitting for it. Then I just reduced down to what I wanted. My tank is on a trailer and I use it for spraying weeds that I pull behind my tractor or the Mule.
2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010
Mine has a valve drain on the bottom with a threaded 90 ell screwed on. Around here when I got mine several years ago a local chemical plant (they get them with epoxy resin in them) would load you up with as many as you could haul for NO CHARGE. I would imagine that they still do. They used to clean them up and still give them away. I had gotten another one a couple years early that was steam cleaned but the last one they said I would have to clean it myself. I just first took a high pressure water hose (150 PSI) and hosed out as much of the liquid resin as I could get then added in a couple gallons of gasoline and swished it around with a broom, then drained it out. Burned the gas / resin mixture. It was really clean then. I now use it to store diesel in. Been using it for at least 6 years now for fuel storage.
The little HF 40x48 inch trailer is a perfect match for an IBC tote. But pulling this over disced ground, the little 8" tires plowed instead of rolled. I finally found a pair of 12" car tires on boat trailer rims for $25. Now it pulls a lot easier.