You would be hard pressed to find them anywhere cheaper than ebay. To keep the costs down the fibreglass is usually very thin. If your handy with the fibreglass there is no reason you couldnt do it yourself. Would be much more time consuming than a wooden box and is messier. You would need to build a mould 1st too. This makes building a one-off out of fibreglass much less appealing than wood. The box is made to sit neatly in the corner but your trade off is the small volume which probably wont match the sub that you use, meaning its not going to sound as good.
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