I bought a like new 3711A electronic load (see photo) that is sold under labels of Tekpower, Circuit Specialists, and Array, on eBay for about 1/2 price and it is really nice. Maximum ratings are up to 360 VDC, up to 30 A, and up to 300 watts. All the major current production electronic loads are really versatile, a lot with logging programs and computer control.
There are also a large number of low end units and kits that can be purchased on eBay for very little money if you just want to try one and not spend a lot.