Look for a smaller seed company. Look for heirloom seeds. Also there is a large difference between hybrid seeds and GMO seeds.

All variety of seeds other than heirloom are technically generically modified. But hybrid is just genetic selections and plant breeding. Cross pollination as nature would do naturally just forced by a human hand. The scary GMO stuff is only corn and soybeans so far pretty much. In my semi educated opinion, the issue with GMO seeds is the ability to spray roundup all over the plants. That's what they genetically modified the plant to be able to withstand.

TLDR: Check out jonny seeds