As for block heater you can get a generic block heater like this
Wolverine Engine Oil Heaters Engine Block Heater for 89 bucks. (never been a fan of those dipstick devises) It is a pad that attaches to the underside of the oil pan and from what I heat they work great. (but you need 110 power) Since I am currently planing on extending my fishing season next year it is on my list of stuff to get. But I don't know if they are intended for winter storage devises.