At the risk of asking the obvious, you do realize that grass does not grow overnight and it will likely be a month or so before you can walk on it without killing it? As well as the fact that when you plan on chipping, a green is not just a lawn with a certain type of grass, but there is an entire process involving thousands of dollars of equipment.
Simply put, if you plan on being able to have a chipping green for around $30 in a short period of time you likely need to find a bottle with a genie in it as opposed to a certain type of grass seed.
If you want to spend around $30 for this, take the easy way out and buy a small driving range mat that can be used for full swings, chipping, pitching, indoors, outdoors, etc. etc. This is what I use and it is invaluable and very portable.
Amazon.com: IZZO 1X2 Chipping and Driving Golf Mat - 20217: Sports & Outdoors Amazon.com: Golf Digest Hitting Mat: Sports & Outdoors Dick's Sporting Goods - Golf Shop: Training Aids: Putting Greens / Mats: Wilson Chip 'N Drive Hitting Mat
I've spent $30 on seed for a lawn that I couldn't care if it lives or dies just as long as it was green, then spent about another $40-50 for the device that will simply spread the seed. Now I simply rely on crabgrass to provide the green.
Let's get serious here, as obviously joking did not work, you will spend $30 on seed that will likely do nothing but piss off your parents and harm your lawn. Again, a Chia Pet would be just as useful and likely as much value to your golf game.