Shelterbox
Shelter box costs only £495 and is now a worldwide organisation with many boxes forward deployed. However for Nepal they ars not appealing for Shelter Boxes but for Shelter Kits.
A Kit comprises a tarp, hammer, nails, saw, wire, wire cutters and is probably more useful if there is little suitable space for tents.
A Shelter Kit costs just £35. My club has just funded 10 which is addition to our annual provision of a Shelter Box.
Other useful kit it Aqua Box, not sure the cost now.
Another is Life Straws which can turn foul water into drinking water.