You can buy it from
PC and Parts
look for nothing more then 650VA since a 650VA UPS can give power to up to 390W
so even a 550VA UPS could do its job
when you enter to the site click on :
Connectivity ,Accessories, UPS & Storage Devices tab
scroll down a little bit and you will be able to find the table where there is the list of UPS-s
some good brands are:
Tripple-lite
APC
PCE
you can also check this
site to be sure how much VA you need.
also i heard you where new to PC and Parts.
so PC and Parts is like a Storage Base in Lebanon (not exactly sure where , but I heard it was somewhere near Dora)anyway, they work with Aramex.
to purchase something from them you go to their site and get the code of the item you want
next thing is to email the product name to them @
sales@pcandparts.com or call them @ 03-585 535 as said
here
what they do is , they call Aramex to come and pick up the product and ship it to you
if your product is more then 5KG than they will charge you 5$ for shipping if it's less then 5KG they will charge you not more then 2$ (especially in Dekweneh) any additional 5KG will increase 5$ in shipping as said
here
your product will be at your doorstep in about a day.
also note that most products have VAT to be included (multiply the price of the product by x1.1)