
Slacker Radio Plus
Get the most out of your stations with Slacker Radio Plus. Upgrade to get unlimited skips & song requests while listening without ads.
• Unlimited Skips
• Unlimited Song Requests
• No Audio or Banner Ads
$3.99 per month (billed annually at $47.88)
https://store.slacker.com/store/PremiumRadio.do

Slacker Premium Radio
Get the most out of your stations with Slacker Premium Radio. Premium Radio featuring unlimited skips & song requests while listening without ads.
• Save Songs
• Unlimited Skips
• Unlimited Song Requests
• No Audio or Banner Ads
$7.50 per month (billed annually at $89.99) The 3 and 6 month plans apparently are no longer available.
https://store.slacker.com/store/PremiumRadio10.do
The only difference beside the price is that The Premium Radio allows you to save songs via the web player and portable devices.
I think this is a smart move by Slacker, because I rarely save songs myself and had this option been available I would have likely gone with the $3.99 plan at the time. Clearly Slacker is going to push this $3.99 per month plan as you can't find the Premium Radio plan unless you go the link above. I don't even find any mention of the Slacker Premium Radio plan on their site now. The link above is found in their forum only that I can tell.