I've been burned badly by magazine discounters but I've been buying mags from www.tanga.com
for years. I have more than I can read because they're so cheap. I just bought Trailer Life for $3.99/yr last week. I feel so dumb because I only bought one year and I probably could have bought three.
I can't tell you when the deal will come up again. You sign up with your email and get one email every night with the day's deal. I get Rachael Ray, Taste of Home, Reader's Digest, Popular Photographer and tons more for around $2.99 or $3.99 per year.
They have great customer service. When I didn't like a magazine, they cancelled it and gave me a credit. Not my money back, credit with Tanga.
I've subscribed for years and in my opinion, the Trailer Life mag deal I'll probably come up in the next 3-4 weeks. Sometimes sooner.
Hope that helps!