Recently got a L/H one from the Bay USA $20 + post and a few days later a R/H one for $25 + post. All in around 32 quid.
Needed 'em to replace the Tech 4's i got with a NOS set of Blue MX1000 a few months ago.
Best to pick them up that way as seperates rather than pay big $$££ by those touting pairs
They're thin on the ground,but they do come up quite often if youre prepared to be patient..
Any you see for sale here as pairs will be at a premium £60/70 plus....