You can try BMC https://www.buildwithbmc.com/bmc/store/6718?lat=34.0683231&long=-118.4069666&q=90210
I have used them when I needed some specialty products that nobody stocked.
Are you going nicer than 6 panel doors and 5_1/4 base? If you aren't, have you tried calling the pro desk at Lowe's and home Depot? A lot of times they can put together a better price than "shopping" even with diamond pro rewards.
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