It sort of depends on what you call affordable. Don't skimp on a few bucks...get a good, brand name unit. They will be safe and easy to climb with. I've used Summit's for years. IMO, they are one of the best. I also like Lone Wolf, but they can be a bit pricey. Climbing wise, you usually have two choices... a stand-up sit-down type or one with a hand climber of some sort. Practice BEFORE the season so you become totally familiar with it and can climb quietly. Always use a harness as soon as your feet leave the ground.