I am not endorsing these products and I get no income from the sellers so I suggest you do your own search and find the product that suits your purposes.
eBay listing description
20A brush motor without brake brushed esc Brush Motor Speed Controller rc brake
I bought 4 for a total price of £11.80 with free postage so that was £2.95 each.
I think that listing description is a bit misleading and I would suggest you just search for "20A brushed ESC" and before you click on the cheapest listing, check whether it includes postage.
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