I'm not a fan of pens as they have a tendency to clog. They're also not cost effective.
You wind up with 2 collections of polish, neither one very large.
Build up your polish collection instead, to include every colour in the rainbow and purchase good quality striper brushes & a couple of different sized dotters instead.
This offers you a wider variety of colours, and my experience is that the striper brushes are better to use and give you more control.
You can also use them with water based acrylic paints, which are very affordable as well and go a VERY long way.:green:
hth's
PS: good idea, the mixing of the glitter with clear polish. You can usually find in craft stores, tiny paint pallets. You can use one of those. I also use them for mixing colours, and for dabbing my dotter or striper on it when it's overloaded. Also, craft stores have TONNES of glitter in a myriad of colours. Many that you won't find in striper pens. AND if it's a good quality glitter, you can also add it to your L&P so thereby getting more bang for your buck.