Depending what we think of as cheap...
The TTartisan 50mm f2 is £79 from Amazon and £56 from Pergear.
The Pergear 35mm f1.4 is £119 from Amazon and £95 from Pergear.
I bought from Amazon for the easy return if I wasn't happy but I was happy so I paid too much
I paid £150 for the Syoptic 50mm f1.1 off ebay. If looking for that one I've seen it wrongly described as a f1.2 (as mine was but I could clearly see it was f1.1 in the pictures of it) and it can also be badged as something else. It looks just about identical to the Voigtlander 50mm f2 and that helps if trying to spot it. Actually the first one I had was M mount and I used it with a close focus helicoid but the E mount one focuses closer without the helicoid.
Tempted to something?