I was quoted 23,000 for a brand new 2008 Civic Si 4 door from The Honda way in Abby.
The car is still in their showroom, so I would go check it out.
I also believe Middlegate honda in maple ridge has a silver coupe SI and a silver 4 door SI, both brand new 2008's and they are asking 23,500.
If you are looking used... There is a Blue 2006 Si with 35,xxxkm's going for 17000, I looked at it but picked my car up as the paint was better.
I got my car for 17,600. Its a 2006 Si in Habi Pearl with 33,xxx km's in showroom condition.
If you are even thinking of getting an Si, spend the extra $$ now. I drove my friends LX 5-spd a few days ago... compared to my Si its BORING.
Here is one Si
*******2008 HONDA CIVIC Si SEDAN**BRAND NEW**
it appears the coupe sold. Also notice, you save an additional $1000 if a family member owns a honda. Thats 22,750 for a brand new 08 Si. Hell of a deal, I tried to buy it but I couldn't get a loan big enough

.
If they can do 22,750 for an 08 Si, I would venture they can do 20,000 if you can find an 08 LX or 21,000 for an 09 LX.