That is cheap compared to G.B.
about 4 years ago I got a set from berg for a friends engine they were around $45.00, a year later I ordered a set for my car they cost $85.00, this winter I checked theprice for Mikes car and they were around $129.00 ! Mike has the CB ones and so far they are working fine. The Berg adjusters are real Porsche 911 parts thats why the price jumped.
my bug sounds like an old chevy lol
hope that Chevy is a Corvair, they are very quiet - hydraulic lifters and no adjustments!