Use a winch launch. You're also in Oregon, got any mountains or hills nearby? Slope soaring doesn't have to be done with carbon fiber record setters. Have done all mine with Foamies and had a great time doin it.
You'll have to research the winch but I have a quick video off youtube that shows one in action. These can be pretty fancy OR not so much. I think the one I saw was using a small tire rim for the winder. But, you probably want to try a cheaper system and that will involve a Bungee system. The size you need will depend on the weight of your sailplane and they're has to be info on that. But I'll put a demonstration video of that on. Warning, turn on Close Caption and turn off your speaker. Some folks are great chunks of information but don't understand putting a sock on their microphones when filming in the hurricane.
Winch -
Bungee -
This'n you can actually listen too.
And of course, we probably should at least recognize this one.
The winch is good for LARGE models, you have a bunch of power there, but mostly it reminds me of my short time in the actual Sailplane hobby. The club I was a member of had a car with a 440 in the front and a big old piece of tow rope out the back of it. When you're sitting in the plane and there isn't a tow plane you have to fly the box behind, it's different. Just too bad you don't get that vertical takeoff like you do with a histart on a model.