If you really want cheap curved front tanks, just go for those acrylic tanks from GEX/FivePlan or even Nisso. Glass curved front tanks will always cost more due to the material and workmanship, not to mention the weight and manpower needed to deliver it to your home.
Or, look for 2nd hand sets or get a tank maker to customise one to your specifications at a reasonable price. Pay a visit to the different LFSes near your home and maybe they can give you better rates. Overall, I'd rather think of quality workmanship, over cost considerations.
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