IMO, Zilla is the best way to go when it comes to tanks
Keep in mind that Zilla tanks alone will be the most expense. I want to buy a 20+ long Zilla..that would cost me $60. So I went on craigslist and found me a 20L for $25...with a screen lid
I was just worried after seeing the prices of some of them lol.....after reading on here i am thinking a slightly older corn not a hatchling as it would be more tolerant of handling etc and ... hopefully have a good few feedings under its belt

... now how long would a 10 gallon tank be good for until having to upgrade in size?
Don't worry. There are many options of thermostats. I am currently using a dimmer which is alright but after using it...I really want a digital. If you're going to use a 10gallon and only want to upgrade to 20L..you will need this heat pad. Cheapest one I have found:
http://lllreptile.com/store/catalog...and-rocks/-/zoo-med-10-to-20-gallon-heat-pad/
With the list below..I only spent $30 total on that site for the heat pad,
thermometer probe + shipping.
(Went to home depot for the dimmer..will be upgrading it around christmas.)
Here are all the things needed for heat sources.
Digital T-stat (recommended)
http://cgi.ebay.com/Digital-Temperat...40825561653342
Dimmer (have to watch temps and get it set. Requires messing with)
http://www.homedepot.ca/webapp/wcs/s...k=P_PartNumber
Digital thermometer with probe
http://lllreptile.com/store/catalog/...er-with-probe/
Digital thermometer (optional to observe cool side and humidity)
http://lllreptile.com/store/catalog/...umidity-guage/
Going with a little older snake might be a better choice in your situation. Temperature changes affect them less and they have a record of feeding on a regular schedule.
I bought a 4 month old corn snake...my friend wanted one too so it was $35. We split the price...making us pay $17.50 each. Besides that..this is my first snake and Tang eats great on F/T. If you can go and search ads in your local papers..I am sure you can find cheap deals for F/T corn snakes.
As of age. An older snake doesn't necessarily mean it will be gentle and easy to handle. It all comes down to how the person before you treated it and its personality. Choose wisely among many options of snakes when purchasing.
There is a lot of cheap ways to start out
My total cost:
snake= $17
thermometer(probe) + heat pad + shipping= $30
dimmer= $10 (will switch)
20L tank= $25
aspen= $6
5 pinkie= $5 (to start off my corn)
Total: $93
Hides, branches, fake plants...hides can be made, branches can be sterilized, and fake plants can be bought at dollar stores for less than $2.
So set your limit to $100...leaving $7 towards any tax and if you want add few more mice

Good luck and keep us updated.