I used to use SignNow which was rather inexpensive, but since the Barracuda acquisition, their prices are more in line with the e-signature behemoths, Adobe's EchoSign and DocuSign, which I find rather expensive for light use.
I've just looked at SigningHub (signinghub.com/service-plans.aspx), which at least provides a reasonable, perpetual free plan, but are there any other platform that's affordable? I don't mind paying, but for the use I make of the service, I find that most plans I see are too expensive.
FYI, I paid $99/year with SignNow without any document limit restriction and was happy with the pricing. Unfortunately, I can't find that type of pricing any longer anywhere.