Rubberised pads are a cheap, compact alternative to a greenhouse
Use warming mats to heat your seeds, Gardening advice
How to Use Heat Mats for Starting Seeds - Bootstrap Farmer
How to Use a Seed Starting Heat Mat: Germination for Peppers
Viagrow 20.5 in. x 8.5 in. Seed Propagating Seedling Heat Mat
These Seedling Heat Mats aid germination and stimulate growth by keeping soil at ~70 F, needed by many plants to germinate. Orders $99+ ship free.
Seedling Heat Mats
When is it Warm Enough to Plant?
Tips for successfully maintaining seedlings after germination
Hydrofarm Seedling Heat Mat 48 in. x 20 in.
Stainless Steel Horizontal Storage Tank, 54% OFF
How and when to start your seeds