A) you can always do more than 8 reps
B) Usually, especially at the intermediate level, when your squat goes up your deadlift goes up. Squat 300x20 and your deadlift will go up, also GM's can help the deadlift a lot.
C) Craigslist should have cheap weights, all you need is another set of 45 lbs or 25's if you are using the standard barbell, I would guess you could get that for the price of bands or less.
D) check out rosstraining.com for easy to do stuff at home that costs almost nothing but still actually works.
Good luck with it.