It's tough getting your products onto the most prized mass market shelves. And frankly, it's just not worth it in all cases. If you're going after those overcrowded isles and your brand isn't yet a household name, plan on adjusting your focus from reasonable margins to high volume and razor thin margins. Sure, you can always develop a new mass-market product line, but don't think that your high ticket product buyers won't notice.
Another solution, embrace your limited sales channels and market the exclusivity and integrity of your product and brand. Everyone has something that they just won't go to Wal-Mart to buy. If your brand is positioned properly, keep your margins, focus on quality and spend your money on exclusivity and integrity marketing instead.