I have a logo allergy too
I got a blissfully unbranded, cheap (£10) slim cover with auto sleep/wake from ebay UK but the seller only ships to Europe so that's not going to help you unless you know someone who could ship it on to you. Not fantastic quality obviously but it's OK and I only used it while I was waiting for my Oberon anyway
Edit: for reference, it's
this one Several colours available
And just came across
these which are shipped worldwide