Thamel Area, Kathmandu
MapPoint Nepal in the turn of the road just up from Tom&Jerry's carries the best selection posters that I have found in Kathmandu. That is, if you like mountain panorama posters.
What to buy: There are some spectacular Himalayan sceneries to choose among. Beware of quality, they fade quickly if hanging exposed to sunlight when you return home.
Get them rolled up in a cardboard tube for the trip home.
What to pay: 150-1500 Rs depending on size and quality.
What to buy:
Themel is full of small shops where you can find your souvernir of everything, silk, cashmere, musical instruments, crafts, books, Nepalese tea with beutiful bags, knives...
I personally like paper lamp cover very much. Negotiating the the price of 40Rs each, I bought a lot with different kinds of designs.
What to pay: 40Rs/each
For all your travel related information books, maps, route plan, wall posters try this shop. Prices are okey but you get quality stuffs.
What to buy: Travel related Maps, Books, Picture Post cards, etc.