Cheap and good would be Lonestar gravel or RMC Pacific Materials - Monterey Bay sands.
For the 2ft tank you'll need less than the regular 19 or 20kg sack. Perhaps even lesser than the 10kg you mentioned. Try Teo's plant farm at LCK or Nature Aquarium for some good sources. If you're located in the east, try the farms at Lorong Halus.
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