Bundle with Gravity Rush + LBP PSV + 16GB memory card at 150$/140€ (EU price including VAT).
I'd wait for BF/Xmas season 2014 to do it, by then production costs should be low enough to allow it to be profitable even at that price, and the season would maximise the effect. The bundle should be permanent or at least with no return to a worse situation for the buyers: bundled games could change and memory card size grow in the future, but the price from then on should never grow again (except for richer premium and/or special bundles, obviously, but that low priced bundle should become the entry level offer).