<So these guys will not charge you up the wazoo for some hidden charge/fee/etc.? Is there a limit as too how many you can get?? Some have options for 3 yr subs, does that mean 3 yrs @ $3/yr or 1st year $3, next two $20/yr.>
No, if you order a multi-year subscription, it is the number of years times the quoted price. I have several subscriptions through them, with Popular Science initially being 1 year for $3 on a previous deal, then at a later time doing an add-on renewal for 3 years at $3/year. That is all that was charged.
Ordered a 2 year sub to Discover today and the card is being charged $6 for it.
Of course, being slightly paranoid, I always use a one-time CC number from either Amex Blue or Citi MC to preclude any unexpected renewal charges a few years hence...
As to how many, they have merchandise to sell; buy as many subs as you want.