In the US, we have truecar.com and some others.
+1 for Truecar.com
Also, consider visiting more than one Acura dealer, taking a test drive, and giving if possible a firm date in the near future that you will make a decision. You need to be upfront with them and make sure the salesperson understands that you appreciate their efforts to earn your business but will be visiting other Acura dealer(s). They will want to know and believe that you have decided trim level, color, options. My advice is to tell them that you plan to buy a car on (example) Friday Feb 28th. What I usually tell them and do is say that I plan on taking that day off with the intention of completing the purchase, but also having plenty of time to confirm final dealer out the door price. Inventory levels of TLX are good so your best chance of a deal is the last weekday of the month in whatever month you purchase.
Terms to use in conversations with dealer salespersons - politely but very directly...
"I am not interested in a back and forth negotiation process, the dealer that clearly and completely provides me with the best out the door price will earn my business"
"I have allocated plenty of time to reach my decision and will do so on (specific date), not before."
Keep in mind that the salesperson has been trained to "train" you to say yes. This is important (I used to sell cars).
For example:
Would you like a cup of coffee or a soft drink?
Isn't this feature nice?
Do you like the color?
They know the more they get you to say yes, the more likely you are going to continue to say yes.
Other tips - Avoid going inside to discuss price before you are ready. Stick with the story that you are only interested in their best out the door price when the time comes. You have to decide whether or not to give them your contact info. If so, make it a point to tell them you don't want phone calls but prefer email contact. Reply with courtesy to their emails (they will send) but keep the responses to "Nothing has changed, I will still be making my final decision based on best out the door price on blank date, and thank them for the information without acknowledging any other "pressing" reason they want you to act or commit now/ASAP, etc. Don't put anything more in the email response than that. Likewise, if they call and they probably will even if you ask them not to, keep your response to verbatim the same as suggested for the email response.
Good luck