If you are putting your prices on your site, it does not matter if you use all prods or not, your competition will see your prices.
And let them. You shoudl not be too concerned abnout the competition playign catch up on your public marketing and sales information.
You should be pricing according to your market demands, not your competition, and the same for them.
I wuold even go so far as publsihiung information about your competitors and having links to their sites. That will do you alot of good with the search engines, as you will get indexed for having revelent information when people are looking up your competitors.
I think I'll go do that now on my site :)