[AFMUG] Dc electric load ? Chuck ?

[TJ Trout via Af]

Anyone know of a inexpensive do it yourself way to make a dc constant
current electric load for testing power supplies, lithium batteries , etc ?
Looking for something maybe 2kw+ and the cheapest premade thing I can find
is $3500. Maybe I'll just use a carbon pile load but that will be much less
accurate.