Or you can buy the 'Bag o' Zombies' which bears the 'Zombies!!!' branding for much less and achieves the the same goal. If different colours are needed, use the money you saved to grab some hobby paint and spray them.
Thanks for the suggestions. I linked her the Zombies!!! thing I found on amazon but I think they're actually the zombie figs she already has for the game lol.If pennies represent one figure then 15mm terrain/minis would work well (pennies are often used at bases for 15's). Pre painted 15mm terrain is widely available on ebay.
If she is looking for a cheaper solution then go to Micheals or a craft store and buy....felt!
Grey felt can be cut out for buildings. Small black felt rectangles for windows and brown ones for doors.
Green felt is for woods or vegetation and darker gray or light brown for roads/tracks. Blue for ponds and streams. You can eve stack felt shapes to make contours for hills.
Even better if she decides to go for actual miniatures trees/buildings etc later than the felt can still be used as the base area for the terrain.
I have a feeling she's looking to get some figs like my zombicide stuff which is probably going to cost her more than she wants. I haven't actually played/learned the rules of the game so I'll probably read the rules next time I see her to get a better idea of what she's looking for.