Texas HELOC lenders and advice

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I'm in the Austin area and considering a HELOC for improvments and real estate investments. I know that not every institution offers HELOCS, so I'm wondering if anyone could suggest an impartial (non-sponsored) website that offers a feed of all TX HELOC lenders along with rates, fees, etc. Additionally, it's my understanding that if a HELOC is used for improvements then bids must be submitted to the lender--is this still the case? Thoughts? Advice?