Make a NP (motor start) capacitor from two electrolytics
Motor Caps must be rated for 3kV transients and so must be made of polyurethane plastic or similar and in fact be rated for attachment to the grid to certain X1 or X2 cap standards.   SMPS use dc electrolytic caps for a different purpose cannot and must not be used.  15UKP is a reasonable price.  THe plastic is extremely pure and free of contaminants, and more turns with the lower k dielectric constant found in plastic, is offset by increase in size and cost of a tightly controlled process for quality reasons.

http://ca.mouser.com/ProductDetail/KEMET/C870CG36100AA0J/?qs=sGAEpiMZZMv1cc3ydrPrF0%2fKYujtVgoKqm92MwSkRkI%3d

THe suitable cap will be;


Self-healing
VDE, CQC and UL810 approved
Rated frequency of 50 Hz and 60 Hz
High capacitance density
Safety device protection (pressure release valve)


THere are other AC options that may be cheaper in Ceramic and paper but less reliable. ( ceramic limited to 1uF at 600V)
http://www.kemet.com/Lists/Filestore/EvoxRifaRFIandSMD.pdf