So, I don't want to hamper your enthusiasm, but I'm not sure if your criterion (cheap and paperback) are the best way to build a sutta collection.
The Snp by Fausbol is not horrible, but it's over 100 years old. It's true, the world is a little thin on Sutta Nipata translations. Personally I recommend the one on the readingfaithfully.org link I gave above. It's a paperback by KR Norman. It also includes notes from a second translation where the second translation differed significantly.
As well, there are inexpensive paperbacks on that list for the Vv and Pv that might be a bit more readable than the one you've got.
And, yeah, I don't think that is a good Dhp translation. Again, there is a paperback on the link I gave for Ven. Buddharakkhita. Far better that what you've got.