I paid $99 for my Autozone crappy Interdynamics 134a set! That Harbour Freight set looks alot nicer than mine. I did get a nice old all brass Robinair R12/22 set from a co-workers deceased dad for $30. Did not know about Harbour Freight or Northern Tools at the time. If you can wait ebay has some deals especially for r12 gauges. Search under Robinair, Ritchie Yellow Jacket, Mastercool, snap on, or just do a R12/22 or R134a manifold gauge set search, Check local pawn shops and used tool stores also. But $39 and $49 new, I would run to Harbour Freight.

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1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

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