It really depends on how well your page converts, more than the PPC traffic source. If you can get a lot of people to order your package, you'll make money. If not, the PPC source doesn't really matter.
AdWords is going to have more competition, but it also converts better than any other PPC source. Facebook Ads will start you off at a relatively high CPC, but if you can get a high CTR you can lower your ad cost pretty quickly. Bing's a good middle ground, they have less traffic but less competition as well.
But again, it's really more about your page than the source.