VLAN for small business?

I currently work for a small business.  A local network company just quoted us about $4500 to install three enterprise-level access points, the 24 Port vlan switch, and a sonic wall.  At the site there is two points of entry on either side of the property.  We will need  to broadcast Wi-Fi across the street to another lot where there's a warehouse location with that has no power.  

The current set up is a dlink 24 point switch/Comcast business Internet.  Filesharing works fine.  all our needs are currently met except we have had trouble creating a roaming network/bridging access points to across the street.  I am wondering whether a vLAN is necessary. There is no immediate plans to scale the business to other locations I was under the impression that a vlan was for multiple sites not for a single site.  

Could someone tell me:
1) If the quote is too high?
2) is the vlan overkill? Would it solve the roaming network woes? Would  it be a great builsiness enhancement worth the cost? Any alternatives worth exploring?
tike55Asked:
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Don JohnstonInstructorCommented:
I was under the impression that a vlan was for multiple sites not for a single site.
No.  There are a lot of uses for VLANs. Many of them used in single site environments.
1) If the quote is too high?
Impossible to say for sure. I have a feeling that there are some other factors here. This is being done to provide better wireless access to a building (which is across the street and has no power) that has no network equipment? That the only way to connect is by using an access point which is across the street?
2) is the vlan overkill? Would it solve the roaming network woes? Would  it be a great builsiness enhancement worth the cost? Any alternatives worth exploring?
I can't see how just adding VLANs is going to solve this issue.
Lee W, MVPTechnology and Business Process AdvisorCommented:
An enterprise level access point can cost between $500 and $1500 EASILY.  You're getting 3.  That's $1500-4500.  Plus a 24 port managed Switch that's probably $200-500+, plus the sonic wall is $300-$1000+.  So that's $2000-$5700.  Plus installation.  So to me, it sounds reasonable.

Is the VLAN overkill?  MAYBE, but it's good to manage things and ANY business network, in my opinion, should be using VLAN capable switches.  As for solving your network woes - you really haven't explained what they are or your environment.  Odds are the company quoting is in a MUCH better position to assess your network environment than anyone here can.  If you're not sure about the pricing and solution offered, you might want to get a second and even a third vendor to give you a proposal.

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