In need of playtesting, but having difficulties.

Hey everyone,
If this has been posted before, I apologize, but I couldn't locate it. A link would be appreciated.

Anyway, I have two games that are near complete, but need more playtesting. I have playtested them a ton with my local groups, but am looking for outside opinions. The troubles I am running into is trying to both find people and finding away to replicate my prototype in a way that would be cheap to give others access to.

The game is a worker placement game with a number of cards and individual player sheets. Would creating a PNP be the way to go and just hope the playtesters interested would have meeples or game pieces to substitute?

The other game is a co-op game with a number of hexes and cards, would PNP be the way to go with this as well?

What about sending along the rulebook to the games to see if I could get people to look over them without actually playing the game?

I plan on taking the games to Gen Con in August to find playtesters, but would like to get them as far along as I can before then.

Any info would be wonderful.

Thanks