Maybe that's why I have it in my head - for one of the bottles, I do have the original cork and it seems like it has a pretty good seal going back in. However, I just checked my LHBS website and they have a cheap ($8) corker/plastic plunger. If that would fit my purposes here, I'll just cough up the eight bucks. If I need some 30-90 dollar capper, I'll just stick to the bomber bottles.
I think you should be OK with the cheapo plunger. When I embarked on Mead making, I was going to go that route, but ended up spending the $$$ for a good floor corker. Probably worth the investment considering the number of bottles I have corked, but for a test run of a few bottles, the cheap one is probably fine.
Of course, now I have capped many many more beer bottles than wine bottles and have yet to replace the relatively cheap wing capper that sometimes gives me grief and breaks bottles.