I have bought 6 refurb. kegs from
www.kegconnection.com and they all have worked great for years. Kegconnection replaces all the seals and even sends replacement seals.
All are tested before sent and they run around $35 for the "B" grade kegs.
B grade just means tiny dents and a little loose rubber.
Wait for around Black Friday and they are $25 ea.
I have been very happy will all my purchases from kegconnection