For the time being I have always resorted to growing my plants near windows which often results in "leggy" tomatoes and some loss as I eventually run out of room in the house and then on warm days have to put the plants outside (inevitably every year some get forgotten overnight when temps are still a bit too cool).
However, this year hubby took a day last weekend and with what materials he could scrounge from the barn (no money was spent on this) he created me at least an oasis for my seedlings that will give me my laundry room back for laundry room type activities.