Just their choice of what is stocked.
Personally, I used to recommend Nelly's on these forum's a LOT and not because they are a site sponsor but because they offer quick shipping, local USA support and great warranty support/processing, and from what I have heard solid technical support for those needing it. However over the last several months I haven't been to thrilled with what I've seen from them (Product offering wise, pricing wise (some models seem marked up 3 times what other private label dealers sell for, and especially their dealer program. I applied to be a dealer and was accepted but their is NO straight pricing for dealers, you basically send them what you are wanting and they will tell you what they can sell it to you for, but normally just ask "what are you currently buying from your other supplier for" At any rate I've lost a TON of respect for them since then. I know their main business is "retail" but they shouldn't have a dealer program if they aren't willing to run one like other distributors/wholesalers. I'll gladly submit an application, retail certificate, tax certificate, UPS/FEDex account info, etc if they want to do a real dealer program like I have with other companies, but at this point I just wrote them off) Sorry for the off topic rant
I can't think of a logical reason why they would not carry it, so I would say take your business elsewhere in this case if thats what you need.