Good luck on that one (finding test for cheap). I just scored last week from a local reefer that got out of the hobby and had boxes of Salifert test kits unopened for sale at $5 ea. Some of these tests go for $40-50ea and I picked up 9 different tests for $45. Look at the local reef clubs postings (that is how I found my deal) or anything similar before jumping in and spending a fortune on tests. I also scored a Hanah TDS meter for $20 and a SQWD for $10. In the beginning you will only need a few during the cycle.. but after that you will need more.
1 Nitrate
1 PH
1 Carbonate Hardness/Alkalinilty
1 Calcium
1 Magnesium
1 Phospate
1 Iodine
1 silicate
1 Strontium
1 Nitrate
1 PH
1 Carbonate Hardness/Alkalinilty
1 Calcium
1 Magnesium
1 Phospate
1 Iodine
1 silicate
1 Strontium