Need advice - Ladies 31 Datejust New

[Diamond1]

What to do...
I have fallen in love with the Datejust 31 - Oyster bracelet -Oystersteel yellow gold / diamonds - olive floral face with diamond bezel.
I was able to try on an 'exhibition' watch in Harrods in London - which they were not able to sell me - but they did put my name on the interest list. That was in October and I have not heard a peep.

I have recently turned to a small family Authorized Rolex dealer in an Eastern European country - they have offered to 'order' me one w/ a 30% deposit - wait time 10 months to one year. Comes to approx $22,380 when you do the conversion. No tax back since it's a special order they say per EU law.
I have purchased from this store before-they are very reputable - 3 years ago I purchased a Yachtmaster for my dad's 70th (which is perhaps why they are willing to help me get this one?)

Should I go ahead with the order at this shop? Or put my name on more lists - with perhaps Mayors in the US / Watches of Switzerland in the UK, etc. - prices are coming out cheaper by $900-$1700 with doing the UK pound/ Dollar calculations IF I can ever find one in the US/UK.

What are my chances of actually getting this watch NEW from an AD in US/UK where the price is less? OR do I just pull the trigger pay slightly more and know I will have it?

Have you seen this watch in your travels? Is it actually as RARE as they tell me?