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Early-7k6 Münar Mänder

7.6km/s of delta-v, 16k funds, 30 parts, 5 techs*, and lvl2 launchpad (90 tech points & some funds, depending on difficulty).
With this, you can land on Mun and came back. Or even easier, Minmus!

Now with 3 landing struts! The previous design didn't had, to save on partcount and in tech needs, but I think this is better.

Be carefull with the battery budget in the last stage -the engine won't generate electricity! Turning the ship 180º in the last stage costs around 1EC unit.

The complete trip to Mün surface and back will have around 1km/s left of delta-v, and you need to look for a particularly good landing spot, as you have only 3 landing struts.
It can withstand the typical Mün-Kerbin reentry with a PE of ~40km.

If you have an upgraded VAB, improve the ship. Solar panels or batteries, liquid fuel second stage, stabilization fins...

*:The very first 2 techs (5+5pts), General Rocketry (20pts), Advanced Rocketry (45pts) & Survivability (15pts).