I doubt you'll find anything for $30, but here's something that might work for $35:
quote:
Newegg has a promotion running where you can save $15 on a purchase of $50 or more when you pay with Google wallet. This allows you to get a 1 year PS+ membership for $35.98.
There is one catch- gotta use the Newegg android app. Just put $50 worth of junk in your cart and use Google wallet as your method of payment. If your purchase is more than $50 you'll see a $15 credit when you check out. The promotion runs through Dec 4th. If it seems too complicated for you hang in there...there's usually tons of sales on PS+/XBL Gold 1 year cards this time of year and you'll find one in the next few weeks between $30 and $40. If you want your card NOW though this is a pretty good way to get one.
Links for your convenience:
Playstation Plus Card
You also need to spend $0.01 more to qualify for the $50, so here's a $0.99 Ethernet cable.
Note again: You MUST use the android app and you MUST use google wallet for your checkout.
I haven't tested this myself.