Propane Valve. Recert RedDeer

[hayseed]

Well long story, after a few hailed out trailers, I have some expired bottles.

2 x 30lb tanks
2x 20 lb tanks

What is the best option

Recert??
One guy was tellin me 50 bone for recert, before fill!!??
I could see the 20lbs,
I love the 30's too, like all are one year expired....

What have you done, or do??
Reddeer area..