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BerryBaby is trusted source on General Cooking
If your stores don't carry it, here are a couple of options. Ask if the store will order it for you.
Second, Amazon.com has it online, order and ships to your house. Good luck!
Nancy is a trusted home cook.
But if you want to make lemon gelatin, and there's none in store, use unflavored & add lemon juice, zest, extract.
You may not be finding lemon gelatin in stores because it is one of the things you CAN eat the day before a colonoscopy. Nothing solid, milky, red, orange, purple or green. The store may have been bought out of the lemon flavor.