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High Impact Polystyrene is very similar to ABS in its properties (read more at Wikipedia), but works with different solvents (Limonene for HIPS vs acetone for ABS). Experiments are ongoing for HIPS as a support material due to Limonene not affecting ABS, and a similar cost (vs double for PVA).
3D2PRINT sells 1 kg spools 1.75mm HIPS filament in 5 colors
LulzBot sells reeled/spooled 3mm HIPS filament
Thingibox ships 1kg 1,75mm and 3mm HIPS from Spain
meXhibit HIPS 1 Kg Spools, 500g bundles of 1.75 mm and 3.0 mm from Zürich, Switzerland - As soluble support material for ABS HIPS can be solved in a d-lemonene or in Germany d-limonen bath. Use 97-99% pure limonen / lemonene liquid in water with a condition of 1:10 to 1:3, depending on the complexity and supportive HIPS filament being printed. Don't through away the water/lemonene bath after using it, try to use it a second or third time by adequately adding some lemonade lotion into it.