I have never owned or used a true brooder. I have a cage that I image might have originally been used for a guinea pig. I put my chicks in that, put them on my bathroom counter and cover one side and maybe a little of the roof with a towel. Then I clip my heat lamp to the size of the vanity 6 inches or so above the wire cage roof. I have never once taken a temp reading, I just move the light up or down based on what I see. If they are huddled under the light very tightly I move it a little closer. If they are in the opposite corner from the light they are to cold and I move it down a little bit. Eventually... probably a few weeks later. I'll move the cage out into the chicken coop so they all can see each other a bit. And I have built this small thing that attaches to it so they have a little run inside the bigger chicken run. I'll still use the light at night if I think they needed. Other than a couple cases of pastie butt I've had no other issues along the way using this method. I'm not saying that my method is the best by any means I just want you to know that it is possible to be very successful raising chicks without any special equipment.You can get chicks anytime. They will need to be started in a brooder, because they will need to be kept out of any drafts, at a steady 90 degrees the first week, 85 the second week, 80 the third week, lowering the temp 5 degrees each week, until they're feathered out. Depending on your daytime temps, you may only need to use a heat source in the evening, and through the night for them. When they've feathered in, they're ready for the coop.
For those that are curious the cage came to me for free, the light is clip on light from harbor freight tools, cost $7.00 and the heat lamp bulb is one of the better red ones cost $8.00 total setup cost $15.00.