I am not a new provider, but I am new to the review community. I am trying to get into P411. Right now the requirements are a reference from a P411 member or a review within past 3 months from a season reviewer on any review board.  

Most of the friends whom I meet with are not part of review boards and I don't push the review agenda. I do ask if they have handles and if they say no I don't make them create a handle to review me. P411 members who contact me will not see me because I am not on P411. Someone from another review board asked me if I offer "review specials." It is allowed on that board, but I am not sure if it is allowed here on TER and if I could specifically request P411 reference in exchange for an incentive.

is frowned upon, as it tends to undercut the integrity of the review system.   However, I think it is allowed to give a discount to TER members, and hope that they get the hint.

 
I would suggest that you do urge your clients who you know well to write reviews for you.  Let them know that it is important to you.   This has worked on me, and I suggest countless others.

 
Remember the dictum:   Ask, and ye shall receive.

... giving of any kind of consideration eg a discount for a GOOD review.  Offering a discount for a review isn't prohibited.  I recently got that point clarified by TER Admin.

However, since different people can interpret rules differently, what mrfisher said about offering a discount to TER members vs for reviews is the safer course.  Then when you see them, you can ask if they'd write a review.  Just don't say "good review".  

policy would be to offer a discount to any TER member with x number of whitelists. Usually, the more whitelists, the more likely the individual will write a review for you. Again, avoid using the adjective "good".

Anybody can sign up for TER for free and never review and never post. You can use "established" to mean a TER member with a history of reviews or even a history of recent reviews. Anything to convey that you are hoping that the TER member who receives the discount is likely to write a review.
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You can also suggest to someone new, "No discount this time, but if you write a review, I'll give you a double discount the next time."  
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One more thing: when you advertise, put time limits on your discounts and specials.  
"September Special: TER members get $ off ..."
If necessary, extend it to  
"October Special: TER members get $ off ..."
And so on, as needed.
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An open ended special can generate a DELAY! "I'll see Mary this time and I'll see Sasha for her special next month, or the month after, or the month after that." And it can generate disappointment: "What? No discount? It ended LAST month?? But you didn't advertise that or I would have booked last month and not waited!  Grrrrrrrr."
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Hay! You've got 3 reviews (although you are the only review for 2/3 of the reviewers)! Something must have worked!

I had to pester those people for those reviews and I hate doing that... which is why I don't have any recent reviews.  
I'm not going to push it anymore. If I get P411 cool. If not, i'ts not the end of the world. I just wanted to see if grass was greener on the other side.